Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1990 Suzuki SamuraiFACTORY OEM SERVICE PROCEDURE
Engine Compression
- Check engine compression with engine at normal operating temperature at specified cranking speed with all spark plugs removed (on dual plugs, remove exhaust side only) and throttle wide open. Ensure battery is fully charged and disconnect ignition coil primary connector.
- On Swift models, remove main relay fuse (15-amp) from fuse box in engine compartment. Crank engine until maximum pressure is reached at each cylinder. Lowest cylinder pressure should be at least 75% that of the highest cylinder pressure. On manual transmissions, disengage clutch to lighten starting load on engine.
ENGINE COMPRESSION TEST
| Model | Standard psi (kg/cm2 ) | (1) Minimum psi (kg/cm2 ) | ||
|---|---|---|---|---|
| Samurai | 199 (14.0) | 170 (11.9) | ||
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Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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